Before starting the exercise for relative clauses, please clarify any doubts you may have about the grammatical rules by referring to your grammar guidebook or dictionary. The Instantaneous Composition Method requires you to compose sentences with the target sentence pattern(s) over and over in order to use them almost effortlessly. You should already have the necessary knowledge.
Reference
Genki II - Lesson 15: Using sentences to qualify nouns
Instantaneous Composition Exercise for Relative Clauses
This is not a translation exercise. This is the Instantaneous Composition Exercise. As if a reflexive action, try to create an equivalent Japanese sentence shortly after reading an English script. Try not to think for more than three seconds.
English and Hidden Japanese Scripts
The person who wears blue clothes is Tanaka-san.
青い服を着ている人は田中さんです。
The person who opened the door is Suzuki-san.
ドアを開けた人は鈴木さんです。
(My) older brother who is washing his car is busy.